so the only key you have is not a chipped key? how does it stay running then? does the security light flash? seems odd.
this link is for a new key, its got a transponder in it for security purposes. you should always have more than one set of keys. you never know when stuff gonna grows legs and walks off.
https://www.ikeyless.com/vehicles/Po.../2002/1000382/
you may even have to go to the dealer for this key to be cut/buy it from them. they can cut a new key from your vin # and program it to work.
when i got a new key for my car, i needed the old vat key to make the new key work, without another chipped key you cant do it yourself.